This is the 5th version patchset to add the Linux kernel port for Andes(nds32)processors. Almost all of the feedbacks from v4 patchseries has been addressed.Thanks to everyone who provided feedback on the previous version.

Based on the 16/32-bit AndeStar RISC-like architecture, we designed theconfigurable AndesCore series of embedded processor families. AndesCoresrange from highly performance-efficient small-footprint cores formicrocontrollers and deeply-embedded applications to 1GHz+ cores runningLinux, covering general-purpose N-series cores for a wide range of computingneed, DSP-capable D-series cores for digital signal control,instruction-extensible E-series cores for application-specific acceleration,and secure S-series cores for best protection of the most valuable.

Vincent Ren-Wei Chen and I will maintain this port. Thanks to everyone whohelped us and contributed to it. :) Any feedback is welcome.

Changes in v5: - Remove __NR__llseek and sys_mmap() - Add a comment to explain that we don't have clocksource cycle counter in the CPU - Add volatile in iounmap() - Fix typo Featuretures to Features - Replace CPU_CACHE_NONALIASING with !CPU_CACHE_ALIASING - Fix a endian bug when we try to get val = of_get_property(cpu, "clock-frequency", NULL) - Add screen_info to fix the building error when CONFIG_ VGA_CONSOLE is enabled - Remove unnecessary msync() - Add depends on !64BIT || BROKEN for faraday Kconfig because the descriptor only supports 32bit - Add atl2c binding document - Remove unnecessary include headers - Fix a vector table bug. It placed wrong vector handlers for 2 exceptions. - Fix a vdso bug. It may encounter TLB multi-hit exception because we accidently set it as a global page. - Add proper isb and barrier after some cache operations - Fix a bug in system call restart flow. $r0 ~ $r5 does not be recovered before restarting system call - Fix the build errors for OpenRISC and SPARC because io.h changed. - Update ae3xx.dts to support atl2c.

Changes in v4: - Add atcpit100 timer driver due to it include vdso implementations and sent them together with nds32 may help reviewer to review. - Update ae3xx.dts for atcpit100 clock setting and remove vdso settings. - To get cycle counter register by timer driver instead of dts. - Use "depends on NDS32 || COMPILE_TEST" in atcpit100 driver because it is needed for nds32 vdso - Update defconfig becasue kconfig rename from CONFIG_CLKSRC_ATCPIT100 to CONFIG_TIMER_ATCPIT100 - Remove ag101p.dts because we are not yet ready for ag101p platform. - Update copyright style to SPDX-License-Identifier - Include <linux/uaccess.h> instead of <asm/uaccess.h> - Add local_irq_save()/local_irq_restore() to protect SR_TLB_VPN in update_mmu_cache(). - Update cpu_dcache_inval_all implementation to make sure all level cache are writeback.